Something interesting about Shavuos different than the other regalim is that Shavuos doesn't have any mitzvos of its own. Whereas Sukkos has eating in a sukkah and lulav & esrog, and Pesach has eating Matza/Marror etc., the things we do on Shavuos, like staying up all night, eating dairy, reading megilas Rus are all minhagim, and not mitzvot
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